If you change settings in game and press apply the graphics start artifacting rather violently with random assets blinking white; clicking OK on graphics settings does this as well but less often. LOD meshes don't stitch correctly and result in gaps in the world.

Changing graphics settings degrades the performance further, the game artifacts if you run it in windowed or full screen and the resolution doesn't match AND it will drop a lot of frames (delta 18 FPS)

Full screen is poorly behaved, it drops performance noticeably, doesn't actually get full (and due to how the game handles being scaled it also drops a significant amount of frames) -- windowed mode works better but still has artifacting problems.

Incorrect bounds if the game can't draw at the exact resolution specified for any reason.

Sometimes the game doesn't respond to input at all on starting it, even if in focus, forcing it to scale using the window manager fixes this [but causes artifacting]

The game runs at about 24-45 FPS when not in combat and stutters unplatably during combat with anything but minor adds (that is to say, you can't fight bosses, BAMs, or large dungeon groups) -- this is irrespective of graphics settings or resolution (tested lowest settings 1080p and max settings 4K, 12 FPS delta 24 vs 36)

The game crashes on opening giftboxes on both proton 5 and 6. It does not crash in 6.x GE but this report concerns standard proton.